UILaunchImageOrientation
A string containing the orientation of the image
Possible Values
PortraitThe image has portrait orientation.
PortraitUpsideDownThe image has portrait orientation but is upside down.
LandscapeThe image has landscape orientation.
LandscapeLeftThe image is in landscape orientation with the bottom of the device on the left side.
LandscapeRightThe image is in landscape orientation with the bottom of the device on the right side.
Discussion
If it is not specified, the default orientation is Portrait.